Lots of good info. The only thing I would add...
Take a waterproof flashlight to explore the cave at Norman Island.
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dayhiker said:
My trip starts in a little over 2 weeks. We'll have 2 15 y.o.'s, 2 13 y.o.'s, and an 8 y.o. We're planning on doing the hike from the Bight to the top of Norman Island and 1 or two other hikes. We're looking at Great Harbour to SDB, Bitter End to an overlook, rambling on Fallen Jerusalem, and Salt Island. We're probably going to rent a kayak so that the kids can play on that while the parents kick back. We will snorkel the usual spots too. It is almost here!

dayhiker, we will be down May 31 - June 7. Girls 24, 18 & 18 and Boy 12